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SWITCHYARD EQUIPMENTS & PROTECTION SYSTEMS
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SWITCHYARD EQUIPMENTS & PROTECTION SYSTEMS

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  • 1. SEMINAR REPORT ON: SWITCHYARD EQUIPMENTS & PROTECTION SYSTEMS. At NTPC-SAIL Power Company Private Limited, Rourkela. Submitted By: PARTHA SARATHI PARIDA REG NO. 10010133 7TH SEMESTER ELECTRICAL ENGINEERING VEER SURENDRA SAI UNIVERSITY OF TECHNOLOGY, BURLA, ODISHA. DEPARTMENT OF ELECTRICAL ENGINEERING
  • 2. NSPCL, ROURKELA CAPTIVE POWER PLANT NTPC Ltd formed joint venture with SAIL on 50:50 basis in March 2001 in the name of NTPC-SAIL Power Company Private Limited (NSPCL). NSPCL took over captive power plant-II located at Rourkela Steel Plant (2X60 MW) from SAIL. 03-Nov-2013 DEPARTMENT OF ELECTRICAL ENGINEERING, V.S.S.U.T,BURLA 2
  • 3. AN OVERVIEW OF CPP :- 03-Nov-2013 DEPARTMENT OF ELECTRICAL ENGINEERING, V.S.S.U.T,BURLA 3
  • 4. MAJOR EQUIPMENT IN CPP :• 2 GENERATORS • 2 GENERATOR TRANSFORMERS • 2 UNIT AUXILIARY TRANSFORMERS • STATION TRANSFORMERS • FEEDERS 03-Nov-2013 DEPARTMENT OF ELECTRICAL ENGINEERING, V.S.S.U.T,BURLA 4
  • 5. TECHNICAL DATA OF GENERATOR UNIT 1 AND 2: • Generator Type : THRI 86/35 • Year of manufacture : 1985 • Stator No. : 1134 & 1135 • Rotor No. : 1134 & 1135 • Exciter type : Static • Apparent power : 75 MVA • Active power : 60 MW • Current : 3.766 KA • Voltage : 11.5 KV +5% • Speed : 3000 Rpm • Frequency : 50 Hz • Power Factor : 0.8 03-Nov-2013 DEPARTMENT OF ELECTRICAL ENGINEERING, V.S.S.U.T,BURLA 5
  • 6. TECHNICAL DATA OF GEN. TRANSFORMER UNIT 1 AND 2: • Make : Crompton Greaves Ltd • Rating : 16.5/33/82.5/ MVA • Type of cooling : ONAN/ONAF/OFAF • No load voltage : HV : 138KV , LV : 11.5KV • Winding : HV : STAR , LV : DELTA • Phases : 3/3 • Frequency : 50 Hz • Vector group : Ynd 11 • Rated current : HV : 345.20Amps ,LV 4141.90 Amps • Total oil qty : 24,470 Lts 03-Nov-2013 DEPARTMENT OF ELECTRICAL ENGINEERING, V.S.S.U.T,BURLA 6
  • 7. TECHNICAL DATA OF UNIT AUX. TRANSFORMER UNIT 1 AND 2: • Make : Crompton Greaves Ltd • Rating : 12.5 MVA • Type of cooling : ONAN • Voltage : HV : 11.5 KV , LV : 6.9 KV • Phases : 3/3 • Frequency : 50 Hz • Vector group : DYN 1 • Rated current : HV : 627.5 Amps , LV:1045.9 Amps • Total oil qty. : 9,000 Lts • Percentage impedance voltage : 7% 03-Nov-2013 DEPARTMENT OF ELECTRICAL ENGINEERING, V.S.S.U.T,BURLA 7
  • 8. TECHNICAL DATA OF STATION AUXILIARY TRANSFORMER: • Make : Crompton Graeves Ltd • Rating : 20/25 MVA • Cooling : ONAN/ONAF • No Load voltage : 132/6.9/3.3 KV (UNLOADED ) • Current: HV 109.3 Amps LV 2091.8 Amps • Frequency : 50 Hz • Vector Group : YNY nd 011 • quantity of oil : 17500Lts 03-Nov-2013 DEPARTMENT OF ELECTRICAL ENGINEERING, V.S.S.U.T,BURLA 8
  • 9. SWITCHYARD: SALIENT FEATURES OF 132KV SWITCHTYARD:• • • • • • • • • 20 OPERATING BAYS 02 GENERATORS 04 GRIDCO FEEDERS 06 SMELTER FEEDERS BUS COUPLER BUS TIE CUM BUS COUPLER STATION TRANSFORMERS 01 BT BAY ISOLATION TRANSFORMERS 03-Nov-2013 DEPARTMENT OF ELECTRICAL ENGINEERING, V.S.S.U.T,BURLA 9
  • 10. IMPORTANT COMPONENTS OF THE SWITCH YARD: 1. BUSBARS: TYPES OF BUSBAR ARRANGEMENTS: 1. Single Bus-bar Arrangement. 2. Single Bus-bar System with Sectionalization 3. Ring Bus-bar system 4. Double Main and Transfer Bus-bar Arrangement 5. Duplicate Bus-bars System 03-Nov-2013 DEPARTMENT OF ELECTRICAL ENGINEERING, V.S.S.U.T,BURLA 10
  • 11. 1. SINGLE BUS-BAR ARRANGEMENT In this arrangement a set of bus-bars is used for complete power station and to this bus-bar are connected all generators, transformers and feeders through circuit breakers and isolating switches. 03-Nov-2013 DEPARTMENT OF ELECTRICAL ENGINEERING, V.S.S.U.T,BURLA 11
  • 12. 2. SINGLE BUS-BAR SYSTEM WITH SECTIONALIZATION With increased number of generators and outgoing feeders connected to the bus-bars, it becomes essential to provide arrangement for sectionalizing the bus-bars so that a fault on any one section of the busbars may not cause a complete shutdown. This is achieved by providing a circuit breaker and isolating switches between the section. 03-Nov-2013 DEPARTMENT OF ELECTRICAL ENGINEERING, V.S.S.U.T,BURLA 12
  • 13. 3. RING BUS-BAR SYSTEM In this arrangement each feeder is supplied from two paths, so that in case of failure of a section, supply is not interrupted. 03-Nov-2013 DEPARTMENT OF ELECTRICAL ENGINEERING, V.S.S.U.T,BURLA 13
  • 14. 4. DOUBLE MAIN AND TRANSFER BUS-BAR ARRANGEMENT This arrangement incorporates all advantages of the double bus as well as transfer bus scheme. This scheme needs a bus-coupler for the on load transfer of circuits from one main bus to the other and a transfer coupler for taking out circuit breaker of various circuits for maintenance. 03-Nov-2013 DEPARTMENT OF ELECTRICAL ENGINEERING, V.S.S.U.T,BURLA 14
  • 15. 2. BUS COUPLER: • Two different bus sections of two different power transformers are connected by means of a bus coupler. • The bus coupler becomes useful when one of the power transformers fails or a fault occurs in either of the bus sections. 3. INSULATORS: • The overhead line conductors should be supported on the poles or towers in such a way that currents from conductors do not flow to earth through supports i.e., line conductors must be properly insulated from supports. This is achieved by securing line conductors to supports with the help of INSULATORS. • The insulators provide necessary insulation between line conductors and supports and thus prevent any leakage current from conductors to earth. 03-Nov-2013 DEPARTMENT OF ELECTRICAL ENGINEERING, V.S.S.U.T,BURLA 15
  • 16. TYPES OF INSULATORS: 1.PIN TYPE: 3. STRAIN INSULATORS: 03-Nov-2013 2. SUSPENSION TYPE: 4. SHACKEL INSULATORS: DEPARTMENT OF ELECTRICAL ENGINEERING, V.S.S.U.T,BURLA 16
  • 17. 4. CIRCUIT BREAKER & RELAYS: • A circuit breaker is an automatically operated electrical switch designed to protect an electrical current from damage caused by overload or short circuit. • Its basic function is to detect a fault condition and, by interrupting continuity, to immediately discontinue electrical flow. • The circuit breaker works along with the relays which give a tripping signal in case of any irregularity or the faults. • The circuit breaker then opens to open the circuit such that other instruments of the system can be protected. 03-Nov-2013 DEPARTMENT OF ELECTRICAL ENGINEERING, V.S.S.U.T,BURLA 17
  • 18. 5. ISOLATORS: (GOD)- GROUP OPERATED DISCONNECTOR: • It is used to make sure that an electrical circuit can be completely deenergised for service or maintenance. • It allows isolation of apparatus such as circuit breakers and transformers, and transmission lines, for maintenance. • GOD’s are provided to facilitate isolation of breakers supplying power to various feeders. In 220kv Switchyard, they are designed as 29A, 29B, 29C & 29E as follows     03-Nov-2013 29 A – main bus side GOD. 29 B - Equipment side GOD. 29 C - Transfer bus side GOD. 29 E - Earth GOD. DEPARTMENT OF ELECTRICAL ENGINEERING, V.S.S.U.T,BURLA 18
  • 19. 6. Current and voltage transformers • Current or voltage instrument transformers are necessary for isolating the protection, control and measurement equipment from the high voltages of a power system, and for supplying the equipment with the appropriate values of current and voltage - generally these are 1A or 5Α for the current coils, and 120 V for the voltage coils. CURRENT TRANSFORMER 03-Nov-2013 VOLTAGE TRANSFORMER DEPARTMENT OF ELECTRICAL ENGINEERING, V.S.S.U.T,BURLA 19
  • 20. 8. LIGHTNING ARRESTER: • A lightning arrester is a device used on electrical power systems and telecommunication systems to protect the insulation and conductors of the system from the damaging effects of lightning. • The typical lightning arrester has a high-voltage terminal and a ground terminal. • When a lightning surge (or switching surge, which is very similar) travels along the power line to the arrester, the current from the surge is diverted through the arrestor, in most cases to earth. LIGHTNING ARRESTER 03-Nov-2013 DEPARTMENT OF ELECTRICAL ENGINEERING, V.S.S.U.T,BURLA 20
  • 21. TRANSFORMER YARD: • Transformer yard consists of following types of transformers 03-Nov-2013 DEPARTMENT OF ELECTRICAL ENGINEERING, V.S.S.U.T,BURLA 21
  • 22. CONCLUSION :• Switchyard is most essential part of the power system. • It is the protective part of the whole power system. • Switch yard is also most essential part for transmission, distribution, and collection. BIBILIOGRAPHY :1. http://wikipedia.com 2. http://google.co.in 3. http://www.engineersedge.com 4. http://www.scribd.com 5. http://electricals4u.com 6. Power system Engineering by O P KOTHARI and I J NAGRATH 7. Power System By J B GUPTA 03-Nov-2013 DEPARTMENT OF ELECTRICAL ENGINEERING, V.S.S.U.T,BURLA 22
  • 23. 03-Nov-2013 DEPARTMENT OF ELECTRICAL ENGINEERING, V.S.S.U.T,BURLA 23